Removal of Toxic Pb(II) Ions from Aqueous Solution by Nano Sized Flamboyant Pod (Delonix regia)

Abstract

The removing of toxic heavy metals from aqueous solution by agricultural biosorbents was investigated by studying the effect of nano sized (Delonix regia) and chemically modified biosorbent citric acid Delonix regia (CADR) for removing of Pb 2+ ions. TEM, XRD and EDS, FT-IR, SEM methods were used for characterizing the biosorbent (Delonix regia). The effect of contact time, pH, temperature, dosage of biosorbent, and Pb 2+ ion concentration on adsorption process were studied. The maximum biosorption capacities (q m ) of Pb 2+ by Delonix regia biosorbent was 43.62 mg/g. The highest R. E was (93.5%) at pH 5. FT-IR method showed that the adsorption of metal ions occurs by functional groups on the surface of Delonix regia powder. The biosorption process was endothermic from thermodynamic parameters. The pseudo second-order model more fit (R 2 =0.999) than the pseudo first-order model (R 2 =0.985) from studying the kinetic parameters. The experimental data fit with Freundlich isotherm (R 2 close to 1). This results indicated that Delonix regia is available agricultural, low cost and environment friendly biosorbent for removing the Pb 2+ ions.

Green Synthesis of Silver Nanoparticles using Delonix regia Extract, Characterization and its Application as Adsorbent for Removal of Cu (II) Ions from Aqueous Solution

“…The Positive value of ΔS • suggested an increase in randomness during the biosorption [50]. These kinds of reactions are present in literature [38,39,51].…”

“…The thermodynamic parameters, ΔH, ΔS, and ΔG, for the biosorption process were calculated using the relationships (1) and (2) [38,39].…”

Adsorption characteristics and inhibition effect of two Schiff base compounds on corrosion of mild steel in 0.5 M HCl solution: experimental, DFT studies, and Monte Carlo simulation

“…Also, the tted data of both (potentiodynamic polarization, EIS, and weight loss) the measurements are correlated. (K ads ) represents the adsorption/ desorption values and is calculated from the standard free energy of adsorption (DG o ads ) by eqn (9): 44,46,47 DG o ads ¼ ÀRT ln(K ads  C solvent )…”

FABRICATION OF Mg-Zn-Al HYDROTALCITE AND ITS APPLICATION FOR Pb2+ REMOVAL

“…After the adsorption had finished, the solution was filtered and the filtrate was analysed by an atomic absorption spectrophotometer (AAS). The Pb 2+ adsorption efficiency was calculated by the equation (1) [20,30,31]:…”